460 



INDEX 



Red Algse, 31. 



Reed swamp, 280. 



Regular, 133. 



Reproduction, 2, 11 ; in Algae, 



17 ; in Liverworts, 73. 

 Resistance, 452. 

 Respiration, 36, 38, 175. 

 Response, 178. 

 Rhizoids, 71. 

 Rhodophyceae, 31. 

 Ribs, 189. 

 Riccia, 68. 

 Rice, 360, 362. 

 Rice-production, map showing 



states of greatest, 361. 

 Root, 94, 253, 372 ; development 



of, 180 ; structure of, 256. 

 Root-cap, 255. 

 Root-hairs, 256. 

 Root-pressure, 244. 

 Rootstock, 247, 248. 

 Rose, 403, 404. 

 Rosette-habit, 199, 200, 211. 

 Rotation of crops, 363. 

 Rust, 51, 52, 443. 

 Rye, 359, 360. 

 Rye-production, map showing 



states of greatest, 359. 



8 



Salts, movement of, in soil, 315.' 



Sap, ascent of, 242. 



Saprophyte, 40. 



Sap wood, 243. 



Sargassum, 18. 



Sarracenia, 218. 



Scales, 216. 



Seed, 126, 317; of Angiosperms, 

 147 ; box for germination of, 

 324 ; dispersal, 169 ; germina- 

 tion of, 174, 320; of Gym- 

 nosperms, 127; selection of, 

 319. 



Seed-firms, 333. 



Selaginella, 91, 108, 111. 



Self-pollination, 158. 



Senecio, fruit of, 169. 



Sensitive plant, 212. 



Sepal, 131. 



Sex, differentiation of, 25 ; ori- 

 gin of, 23. 



Sex-organs, 26. 



Shading, projection against, 199.. 



Shasta daisy, 403. 



Sieve vessels, 238. 



Smilax, 225. 



Snapdragon, 133. 



Snowflake, 157. 



Soil, 259, 298, 308. 



Soil fungi, 61. 



Sorus, 96, 97, 98. 



Spanish needles, 173. 



Spermatophytes, 7, 114, 129. 



Sperms, 25 ; of Cycads, 125. 



Spiral leaves, 228. 



Spiral vessels, 237. 



Spirogyra, 27, 29. 



Spongy tissue, 194. 



Sporangium, 22 ; of Ferns, 96, 97. 



Spore, 21. 



Sporophore, 47. 



Sporophyll, 97. 



Sporophyte, 76, 81, 83; of 

 Angiosperms, 130 ; of Gym- 

 nosperms, 118. 



Spot diseases, 434, 435, 436, 437, 

 438, 439. 



Squash, 385. 



Stamen, 121, 123; of Angio- 

 sperms, 134. 



Stem, 93, 224 ; structure of, 235. 



Stigma, 138. 



Stimulus, 178. 



Stomata, 192, 193. 



Stone-fruit diseases, 441. 



Storage form, 36. 



Strawberry, 391, 398; spot dis- 

 ease of, leaves, 437. 



Strawberry-plant, 231. 



Street trees, 428 ; care of, 430. 



Strobilus, 104 ; of Gymno- 

 sperms, 118, 119, 120, 121, 

 122. 



